I was wondering whether there's a more updated method of doing this, maybe a network module for a 2600/2800 that actually terminates into RJ45s (instead of DB25s)? Anyone know whether a more modern setup is available?

Mark, we're looking for a hardware solution because we have plenty of spare 2600 routers for use. I'll definitely look into your suggestion, though, since it's a free solution. Thanks for the thoughts!